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Lighting Equipment Questions
How can we detect an object that is the same color as the background?
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There are a number of ways, some of which are more difficult to achieve than others. Use lighting to light up the different heights differently. Use 3D technology to give you a height difference if it exists. Image formation with regards to machine vision is about getting the image to show you the thing that you are looking for. Its much easier to answer whilst looking at samples. If the samples are opaque, but are very similiar if the one at the front has a height difference, then 3D machine vision may be your answer. Good Luck.
I personally would first look at the material of the part versus the material of your background. I.E. If you are inspecting a metal part and your background is rubber, my initial thought would be an infrared lighting solution. The rubber will absorb the infrared light differently then the metal part giving you a starting point to create contrast. If that alone does not create enough contrast, I would continue testing with filters. If your part is made from a similar material as your background, darkfield illumination would be something to consider as this should allow you to project majority of the light onto the surface of your part. This should illuminate the surface your part while leaving your background dark.